- TIA 568B Pins 1-2 & 4-5 (2-pair)
- Referred to as: T, T1, T Span, DS1, Span.
- Fully provisioned throughput: 1.544 mbps. (mega(million) bits per second)
- Lowercase b = bit, Uppercase B = Byte.
- 24 Channels B8ZS Clear Channel Signalling.
- 23 Bearer Channels, 1 Data Channel - PRI (Primary Rate Interface).
- Channels referred to DSO's @ 64 kbps (kilo (thousand) bits per second) per channel.
- DSO = Digital Signal Level 0 (64 mbps).
- DS1 = Digital Signal Level 1 (1.544 mbps).
- DS3 = Digital Signal Level 3 (45 mbps).
- 8 or more Trunks justifies cost of T1 Technology.
- Can be back-hauled if Local Central Office does not support digital technology.
- Tariffed based on distance from the Central Office to the Customer's POP/Demarcation Point.
- Supports Voice, Data and Video.
- Drop and Insert allows channelized use for Voice, Data and Video on the same Span.
- Problems: Gain Hits, Bipolar Violations, Frame Drops.
- Best feature: Reliability.
- Can be configured for Inbound, Outbound, Long Distance, 800 Voice Services.
- In-house PBX's can deliver T1 Services to internal Communication Servers.
- Fractional T1 Services may be purchased x channels at a time.
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